diff -r 000000000000 -r bde4ae8d615e os/mm/mm_pub/audio_effects_api/inc/MEnvironmentalReverbObserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/mm/mm_pub/audio_effects_api/inc/MEnvironmentalReverbObserver.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,57 @@
+/*
+* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  This is the definition of the reverb effect observer class.
+*
+*
+*/
+
+
+#ifndef MENVIRONMENTALREVERBOBSERVER_H
+#define MENVIRONMENTALREVERBOBSERVER_H
+
+// INCLUDES
+
+#include <e32base.h>
+#include <EnvironmentalReverbBase.h>
+#include <MAudioEffectObserver.h>
+
+
+// CLASS DECLARATION
+
+/**
+*  This is the reverb effect observer class. Object interested in receiving notification
+*  when the CEnvironmentalReverb object changes state should derive from this class and implement
+*  its interface.
+*
+*  @since 3.0
+*/
+
+class MEnvironmentalReverbObserver : public MAudioEffectObserver
+	{
+	public:
+		static const TUint KDecayTimeChanged = KSpecificEffectBase + 1;
+		static const TUint KDecayHFRatioChanged = KSpecificEffectBase + 2;
+		static const TUint KDensityChanged = KSpecificEffectBase + 3;
+		static const TUint KDiffusionChanged = KSpecificEffectBase + 4;
+		static const TUint KReflectionsDelayChanged = KSpecificEffectBase + 5;
+		static const TUint KReflectionsLevelChanged = KSpecificEffectBase + 6;
+		static const TUint KReverbDelayChanged = KSpecificEffectBase + 7;
+		static const TUint KReverbLevelChanged = KSpecificEffectBase + 8;
+		static const TUint KRoomLevelChanged = KSpecificEffectBase + 9;
+		static const TUint KRoomHFLevelChanged = KSpecificEffectBase + 10;
+	};
+
+#endif	// of MENVIRONMENTALREVERBOBSERVER_H
+
+// End of File
\ No newline at end of file